package cn.com.pet.common.util;

import java.security.MessageDigest;

public class MD5Util {

	private final static String[] hexDigits =
	{ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d",
			"e", "f" };

	public static String MD5Encode(String origin)
	{
		String resultString = null;
		try
		{
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			resultString = byteArrayToHexString(md.digest(resultString
					.getBytes()));
		} catch (Exception ex)
		{
		}
		return resultString;
	}

	public static boolean validateMD5(String before, String after) {
		return after.equals(MD5Encode(before));
	}

	private static String byteArrayToHexString(byte[] b)
	{
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++)
		{
			resultSb.append(byteToHexString(b[i]));
		}
		return resultSb.toString();
	}

	private static String byteToHexString(byte b)
	{
		int n = b;
		if (n < 0)
		{
			n = 256 + n;
		}
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}

	public static void main(String[] args) {
		System.out.println(MD5Util.MD5Encode("000000"));
	}
}
